MIMOレーダーにおける到着方向推定のためのアウトリアー・ロバスト三要素非均一線形配列の設計戦略
Andrea Quirini1, Fabiola Colone1, Pierfrancesco Lombardo1
1Department of Information Engineering, Electronics and Telecommunications DIET, Sapienza University of Rome, 00184 Rome, Italy.
Sensors (Basel, Switzerland)
|August 28, 2025
まとめ
この研究は,複数の入力と複数の出力 (MIMO) の構成で正確なターゲット到着方向 (DoA) の推定のために非均一な線形配列 (NULA) を使用する堅牢なレーダーシステムの新しい設計を導入します. 最適化された配列は推定誤差を軽減し,実用的なレーダーアプリケーションの信頼性を向上させます.
科学分野:
- シグナル処理
- レーダーシステム工学
- 配列信号処理
背景:
- 多入力多出力 (MIMO) レーダーシステムの到着方向 (DoA) の推定は,ターゲット追跡に不可欠です.
- 最大確率 (ML) ベースの DoA 推定方法は,確率関数のローカルマキシマによって引き起こされる異常値に敏感です.
- 配列の構成は DoA 推定の正確性と堅実性に大きく影響します.
研究 の 目的:
- 3要素の非均一な線形配列 (NULA) 構成のための新しい設計戦略を開発する.
- 多入力多出力 (MIMO) レーダーシステムのNULA配置を最適化し,ターゲット到着方向 (DoA) の見積もりを強化します.
- DoAの推定における推定精度を最大化しながら,偏微値の確率を最小化する.
主な方法:
- 送信機と受信機の位置が異常値の発生とML DoAの推定精度に与える影響を調査した.
- 配列設計を導くために DoA Mean Squared Error (MSE) の理論的予測を活用した.
- 亜空間内のNULA要素のポジションのための共同最適化戦略を提案し,低アウトリア可能性を確保しました.
主要な成果:
- シングル・トランスミッターNULA構成と比較して優れた推定精度を達成した.
- オプティマイズされた配列のサイドロブが減少したため,アウトライヤーに対する強化された強度を示した.
- 物理的な制約を考慮して,低コストの3x3または2x3MIMOレーダーで実用化するためのアプローチを検証した.
結論:
- 提案された設計戦略は,MIMOレーダーシステムのDoA推定における異常値を効果的に軽減します.
- 最適化された3要素のNULA構成は,より高い精度と強度を提供します.
- この方法は,実際のコストに敏感なレーダーアプリケーションに実用的です.
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